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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Questions  >  Ferranti effect is not a problem for ________... Start Learning for Free
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Ferranti effect is not a problem for ________
  • a)
    Long Transmission lines
  • b)
    Medium Transmission lines
  • c)
    Short Transmission lines
  • d)
    Transmission line having high capacitance
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Ferranti effect is not a problem for ________a)Long Transmission lines...
Explanation:

Ferranti effect is a phenomenon of voltage rise at the receiving end of a long transmission line due to the capacitance of the line. This effect is not a problem for short transmission lines as the capacitance of the line is low.

Short Transmission Lines:

A short transmission line is a line whose length is less than 80 km (50 miles) and has a voltage level less than 69 kV. The capacitance of a short transmission line is low, so the voltage rise due to the capacitance is negligible. Therefore, Ferranti effect is not a problem for short transmission lines.

Long Transmission Lines:

A long transmission line is a line whose length is greater than 250 km (150 miles) and has a voltage level above 200 kV. The capacitance of a long transmission line is high, so the voltage rise due to the capacitance is significant. Therefore, Ferranti effect is a problem for long transmission lines.

Medium Transmission Lines:

A medium transmission line is a line whose length is between 80 km (50 miles) and 250 km (150 miles) and has a voltage level between 69 kV and 200 kV. The capacitance of a medium transmission line is moderate, so the voltage rise due to the capacitance is significant, but not as much as in the case of long transmission lines. Therefore, Ferranti effect may be a problem for medium transmission lines.

Transmission Line Having High Capacitance:

Transmission lines having high capacitance, such as underground cables, may also experience Ferranti effect. The capacitance of underground cables is much higher than overhead lines, and the voltage rise due to capacitance can be significant. Therefore, Ferranti effect is a problem for transmission lines having high capacitance.

Conclusion:

Ferranti effect is not a problem for short transmission lines as the capacitance of the line is low. It is a problem for long transmission lines and transmission lines having high capacitance. Ferranti effect may be a problem for medium transmission lines as well, but not as much as in the case of long transmission lines.
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Community Answer
Ferranti effect is not a problem for ________a)Long Transmission lines...
Ferranti effect is happens when line to earth capacitance becomes more than the inductance parameter. This effect is more predominant in medium and long transmission lines but is not a problem for short transmission lines. This is because line to earth capacitance for short transmission line is negligible.
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it depends on the length of the conductor the capacitance of the line is proportional to the length of the transmission line their effect is negligible on the performance of short having a length less than 80 km and low voltage transmission accidents of the transmission line along with the conductances forms the shunted mittens the conductance and the transmission line is because of the leakage over the surface of the conductor considered a line consisting of two conductors and be each of radius are the distance between the conductors being Des shown in the diagram below minus the potential difference between the conductors and via's work QA charge on conductor QB charge on conductor vvab pencil difference between conductor and the Epsilon minus absolute primitivity QA plus QV = 0 so that QA equals QB - equals DBA equals data equals DB equals our substituting these values and voltage equation we get the capacitance between the conductors is cab is referred to as lying to line capacitance if the two conductors are in VR oppositely charge then the potential difference between them is zero then the potential of each conductor is given by one half bath the capacitance between each conductor and point of zero potential and is capacitive CN is called the capacitance to neut or capacitance to ground capacitance cab is the combination of two equal capacity and VN series thus capacitance to neutral is twice the capacitance between the conductors IE CN equals to Cave the absolute primitivity Epsilon is given by Epsilon equals epsilono Epsilon are where epsilano is the permittivity of the free space and Epsilon or is the relative primitivity of the medium prayer capacitance reactants between one conductor and neutral capacitance of the symmetrical three phase line let a balanced system of voltage be applied to a symmetrical three-phase line shown below the phasor diagram of the three phase line with equilateral spacing is shown below take the voltage of conductor to neutral as a reference phaser the potential difference between conductor and we can be written the similarly potential difference between conductors and sea is on adding equations one and two we get also combining equation three and four from equation 6 and 7 the line to neutral capacitance the capacitance of symmetrical three phase line is same as that of the two wire line Related: Capacitance of Transmission Lines?

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Ferranti effect is not a problem for ________a)Long Transmission linesb)Medium Transmission linesc)Short Transmission linesd)Transmission line having high capacitanceCorrect answer is option 'C'. Can you explain this answer?
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